auth: ability to require new cephx signatures on messages (still off by default)

The last couple of weeks have also seen steady forward progress on v0.58, which will be out in two weeks. Now is probably as good a time as any to mention that we’ve solidified our release timeline for the next couple of months. Each development release will be out on a regular two-week schedule (feature-frozen and then delayed one sprint, or two weeks, for QA), culminating in the freeze for v0.61 “cuttlefish” at the beginning of April, to be released at the end of the month.